Getting error 'XMLHttpRequest cannot load /socket.io' in case of socket.io - node.js

Question

I am getting error:"XMLHttpRequest cannot load /socket.io " for socket call. what's wrong there,i am not getting it.i am new to web sockets,my other api call is running good,but socket.io call is not working. i have installed ssl certificate for nginx,help me guys.
My nginx configuration is
server{
listen 80;
server_name example.com;
return 301 https://$server_name$request_uri;
}
server {
#listen 80;
listen 443 ssl;
# Make site accessible from http://localhost/
server_name www.example.com;
ssl_certificate "/home/oodles4/sslcertificate/public.crt";
ssl_certificate_key "/home/oodles4/sslcertificate/keyfile.key";
proxy_set_header X-Forwarded-For $remote_addr;
add_header Strict-Transport-Security "max-age=31536000; includeSubdomains";
#location / {
root "/home/oodles4/Documents/dcx/user/dev";
#root "/home/oodles4/Documents/dcx/explorer";
index home.html home.htm;
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
# Uncomment to enable naxsi on this location
# include /etc/nginx/naxsi.rules
# }
location /{
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_script_name;
9,51 2%
#location / {
root "/home/oodles4/Documents/dcx/user/dev";
#root "/home/oodles4/Documents/dcx/explorer";
index home.html home.htm;
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
# Uncomment to enable naxsi on this location
# include /etc/nginx/naxsi.rules
# }
location /{
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_script_name;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;
fastcgi_param HTTPS on;
fastcgi_param HTTP_SCHEME https;
}
location /admin{
alias "/home/oodles4/Documents/dcx/admin/dev";
index home.html home.htm;
}
location /api {
proxy_pass http://localhost:8080/api;
}
location /admin/api{
proxy_pass http://localhost:8080/api;
}
location /explorer{
alias "/home/oodles4/Documents/dcx/explorer";
# try_files $uri $uri/ /views/main/main.html;
index dev/views/main/main.html;
}
location /explorer/api{
proxy_pass http://localhost:3000/api;
}
when i do '/explorer', my all api's call and socket will work
var socket = io.connect('http://www.example.com:3000', {
'reconnect': true,
'reconnection delay': 500
});

Answer 1

I guess you have server blocks to listen on ports 80, 443.
but you do not have any server block to listen on 3000.
Here i assume that you have any application running on port 3000.
Just append this block to current nginx configuration.
server {
server_name example.com www.example.com;
location / {
proxy_pass http://localhost:3000/;
}
}